浑善达克沙地不同龄级沙柳灌丛土壤有机碳研究

昭日格 乌仁陶格斯 苏楞高娃

摘要[目的]研究浑善达克沙地不同龄级人工沙柳灌丛土壤有机碳分布规律，为进一步研究干旱区群落演替过程中碳收支以及生态恢复过程中的植被類型选择提供科学依据。[方法]对浑善达克沙地不同龄级（2、4、6、8 a）人工沙柳灌丛土壤pH、容重、有机碳、碳密度进行研究。[结果]土壤pH在7.34～7.60，且与土壤有机碳的变化无明显相关性。同一龄级植被垂直分布上，表層土壤容重较底层低，与土壤有机碳含量的变化呈负相关。土壤有机碳在0.44～1.10 g/kg，不同龄级沙柳灌丛不同土层土壤有机碳含量均随林龄的增加出现先减低后升高的趋势，同一龄级沙柳灌丛不同土层的土壤有机碳含量无明显的变化规律。表层土壤碳密度随着龄级的增大呈先降低后增加的趋势。8 a沙柳灌丛土壤碳密度最高，为9.59 kg/m2；随着土层的加深土壤碳密度不断增大。[结论]沙柳灌丛对沙地植被恢复、土壤碳库有重要作用。

关键词浑善达克沙地；沙柳灌丛；pH；土壤有机碳；碳密度

中图分类号S714文献标识码A文章编号0517-6611（2017）17-0039-03

Abstract[Objective]To study distribution regularities of soil organic carbon of different age classes of Salix psammophila shrubs in the Hunshandake Sand Land， in order to provide a scientific basis for further study on carbon budget in the process of community succession and selection of vegetation types in the process of ecological restoration. [Method]The soil pH， bulk density， organic carbon and carbon density of the different ages （2， 4， 6， 8 a） of artificial Salix psammophila shrubs in Hunshandake Sand Land were studied. [Result]The results showed that the soil pH of Salix psammophila shrubs was 7.34-7.60. There was no significant correlation between soil pH and soil organic carbon content. In the vertical distribution of vegetation in the same age， the bulk density of the surface layer was lower than that of the bottom layer， and it was negatively correlated with the change of soil organic carbon. The contents of soil organic carbon in different ages of Salix psammophila shrubs were between 0.44 and 1.10 g/kg. Both of the different ages of Salix psammophila shrubs and the soil organic carbon content in different soil layers with the increase of woods ages showed a trend from decline to rise， there was no obvious change of soil organic carbon in different soil layers of Salix psammophila shrubs. The soil carbon density in the soil surface decreased first and then increased with the increase of age. The soil carbon density of 8 a Salix psammophila shrubs was 9.59 kg/m2， and the soil carbon density increased with the increase of soil level. [Conclusion]The results display that Salix psammophila shrubs play an important role in vegetation restoration and soil carbon pool.

Key wordsHunshandake Sand Land；Salix psammophila shrubs；pH；Soil organic carbon；Carbon density

基金项目国家民族委员会项目（14HTZ012）；内蒙古自治区高等学校科学研究重点项目（NJZZ229）；2015年内蒙古自治区人才基金开发基金项目。

作者简介昭日格（1983—），女，内蒙古赤峰人，助教，硕士，从事干旱区资源恢复及森林草地生态系统研究。

收稿日期2017-05-19

陆地生态系统的碳库包括植物和土壤2部分，植被碳库和土壤碳库碳贮存量约为大气碳库的3倍，在气候变化和全球碳循环中起着重要作用[1]。……